Drill-chuck



(No'ModeL) D. SLATE. DRILL GH-UGK.

No 243,806. Patented July 5, 1881'.

0 .w, y ww UNITED STATES PATENT OFFICE.

DWIGHT SLATE, OF HARTFORD, GONNEGTIGUT.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 243,806, dated July 5, 1881.

Application filed April 2:2, 1881. (No model.)

To all whom it may concern:

Be it known that I, DWIGHT SLATE, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Drill- Chucks and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

My improvement relates to drill eh ucks, such as are used to fitinto the revolvlng head of a lathe or-drilling machine to hold the drills of various sizes that it is desired to use, the same chuck usually holding several sizes of drills.

Chucks of a great variety of form and construction have heretofore been in use for this purpose, and the object of my invention is to provide a chuck which will hold several sizes of drills firmly and centrally in angular bearings, and at the same time be of more simple construction than has heretofore been in use.

In the accompanying drawings, illustrating my invention, Figure 1 shows a side view of my improved drill-chuck. Fig. 2 is a lougitudinal section, showing the construction. Fig. 3 is across-section on the line a b ofFig. 1. Fig. 4 is a cross-section on the line 0 d of Fig. 1.

A and B are the two parts of which the body of the chuck is formed. Upon the inside of each piece a triangular groove is cut through the middle longitudinally from end to end, so that when the parts are placed together the two grooves form a square hole through the body of the chuck. When placed together the two parts A and B are turned up true, in the same manner as though the chuck were turned out of one piece of metal.

0 is a collar turned to a circular form, and havingits interior tapering slightly inward from the two ends. It fits over the rear ends of the parts A-and B when they are placed together, and when driven on holds them firmly together. The rear ends of the parts A and B are turned to a taper to fit the interior of O. In front of the collar 0 the body of the chuck is hollowed out, as shown at I), so that the sides can be bent or sprung slightly at that point. From D to the front end of the chuck the parts A and B are slightly freed, so that they do not come quite together when the rear end is clasped by the collar 0.

E is a screw-bolt passing through the two sides A and B. It is furnished with nuts at the ends, (shown at F and G,) one of which, F, serves as a head, and the other, G, has flattened sides for turning and drawingthe two parts A and B together. The middle of the bolt is enlarged and fits into a recess in the sides. This enlargement is for the purpose of permitting a larger hole through the bolt for the passage of the drill-shank than would be convenient if the bolt were of one uniform size throughout. This enlargement of the bolt prevents it from turning. If the bolt is of uniform size a key is required for this purpose.

The rear end of the collar 0 is made to fit upon a shank which is driven into the socket in the spindle of the lathe or drilling-machine in the customary manner.

The operation of my improved chuck is as follows: The nut G is loosened and the drill inserted into the angular hole through the middle, between the two sides or jaws. The rear end of the drill is then held by clamping the nut G. The collar is then placed upon the shank in the revolving spindle and driven on sufficieutly hard to prevent its turning.

By means of my improvement a simple chuck having spring-jaws can be made with a square or angular opening to hold the drill, which permits drills having round shanks of different sizes to be held firmly when clamped between the jaws.

What I claim as my invention is- 1. In a drill-chuck, the collar 0, in combination with the sides A and B, said collar serving as a band for uniting the rear ends of the sides to form spring-jaws, and also as a means of securing the chuck to the revolving spindle, substantially as described.

2. The combination of the separate flexible sides A and B, secured at their rear ends by the collar '0, and having interior angular grooves for holding the drill, with the clamp E G, having a hole through the shank of the bolt, substantially as described.

DWIGHT SLATE. 

